I added a Ronin to an HPA QB78 using a slip-on adapter. It shoots with the same POI with the adapter on or off (suppressor not mounted), but I get a 1 inch lower and right group with the Ronin. POI shifts consistently when the Ronin is on. Does anyone else have this experience when installing/removing suppressors? What gives? I doubt it's barrel droop - this QB has a pretty stout barrel (15mm bull/straight). I did not get around to checking velocity yet with it on/off, and it's hard to say yet if the group size is changed because I was shooting on a gusty day.